First DI from Today’s Mains Class was Beautiful,

It contains some Important Concepts like,

1. Still Water Speed & Stream Speed

Downstream Speed = Boat + Stream
Upstream Speed = Boat − Stream

⸻

2. Floating Object (Log) Theorem

A floating object always moves with the stream.

⸻

3. Relative Speed with a Floating Object

When a boat and a log move in the same direction,

Relative Speed = Boat’s Still Water Speed

Stream completely cancels.

This is one of the most important hidden concepts.

⸻

4. Time–Relative Speed Inverse Theorem

For the same initial gap,

Relative Speed ↑ ⇒ Time ↓

Useful when two different boats chase the same floating object.

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5. Same Point, Same Time Principle

If two moving objects reach the same destination at exactly the same instant,

their positions can be equated to derive hidden information.

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6. Round Trip Time Splitting

When total journey time is given,

split into

Downstream Time
Upstream Time

before solving.

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Intermediate Concepts

7. Backward Motion Reconstruction

Sometimes the question asks about something before observation starts.

You reconstruct past motion instead of future motion.

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8. Initial Lead (Head Start) Concept

When one object is caught after some time,

first determine

Initial Separation = Relative Speed × Time

This becomes fixed information for later questions.

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9. Position Tracking

Instead of only calculating distance travelled,

track the exact position of every object on the river at every stage.

This DI repeatedly uses position tracking.

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10. Timeline Segmentation

Do not treat the entire motion as one journey.

Break it into phases like

before meeting
before turning
after turning
after second meeting

Check Studified YouTube, Apke liye kal ki jo class lagaai hai.

You will be very happy.

Jaao dekho.

Waiting for this🤨

UDAAN 2.0 2026
DI Class is Live on Yesofficer:

1) Login to Yesofficer
2) Go to My Time Table
3) Join the Class at 7:00 am

Mandatory for you!

10 am: https://www.youtube.com/live/o9BFST_L4dI?si=mhvOCjoEY9E05kKp

Live now🔥🔥⬇️

Click here to join

https://www.youtube.com/live/o9BFST_L4dI?si=mhvOCjoEY9E05kKp

Break is over🔥🧿🌶️🍋

Jaldi aao, aaj bacho ki excitement dekh ke meri energy bhi double hai

https://www.youtube.com/live/o9BFST_L4dI?si=mhvOCjoEY9E05kKp

Mains Infinity 2026 Class is Live on Yesofficer:

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2) Go to My Time Table
3) Join the Class at 7:00 am

आपका पता नहीं, मैंने 6th Gear लगा दिया है 😃

See ⬇️

https://www.youtube.com/live/tYP3ODJUrQ0?si=lwi6930VMs86dM5j

📌 Homework Reminder

Just a reminder for tomorrow evening’s homework.

You have to complete the last two classes of the previous Udaan Pre-DI course (not the current one).

Please make sure you watch and finish both of the last DI classes from the previous Pre-DI course before tomorrow evening.

Hi everyone, an important update.

There was some confusion between a few files, and by mistake the team uploaded the wrong file for SBI PO Mock Test 7 today.

The file currently available is not the actual test. It was an internal sample test, which is why many of you found it unusually difficult.

Please do not attempt Mock Test 7 right now.

The correct file will be uploaded and replaced by tomorrow, 12:00 PM. You can take the test after that.

Sorry for the inconvenience, and thank you for your understanding.

UDAAN 2.0 2026
DI Class is Live on Yesofficer:

1) Login to Yesofficer
2) Go to My Time Table
3) Join the Class at 7:00 am

This session will increase your 3-5 marks in Quant Section.

Starting in 30 minutes

https://www.youtube.com/live/tYP3ODJUrQ0?si=WUeWcenS6gvUIKwP

Live now: Give me just 60 minutes.

https://www.youtube.com/live/tYP3ODJUrQ0?si=WUeWcenS6gvUIKwP

You will feel the difference

✅ Handwritten Notes Update

All the handwritten notes have now been uploaded in THE MATHS HERO 2026.

The Time, Speed & Distance and Boats & Streams practice PDFs have already been shared.

The practice PDFs for Mensuration, Probability, and Number Series will be shared over the next 4–5 days.

Keep revising every chapter regularly. For Mensuration and Probability, you can expect direct questions from the class questions, so make sure you revise both chapters thoroughly.

Good luck! Complete all your targets.

📢 Friday • Saturday • Sunday — No Classes

Please use these three days to focus on revision and practice.

Revise thoroughly, solve as many questions and mock tests as you can, and make the most of this time.

All the best!

📌 Important Update

As informed earlier, Monday and Tuesday will have recorded classes.

✅ Monday’s recorded class has already been published today at 7:00 AM.

Course: Mains Infinity
Class: Mains Infinity – Module 6

Please make sure you complete it on time because your next recorded class will be available tomorrow (Tuesday) at 7:00 AM.

Tomorrow’s Class:
Course: Udaan 2.0 DI
Topic: IBPS PO Pre Paper 1 (Officer Lab) – Detailed Solutions & Analysis

Complete both classes on schedule and stay on track with your preparation.

UDAAN 2.0 2026
DI Class is Live on Yesofficer:

1) Login to Yesofficer
2) Go to My Time Table
3) Join the Class at 7:00 am

SBI PO Pre se phle Puri Revision ki Zimmedar Meri:

Launching 🚀🔥
⬇️

https://www.youtube.com/live/WhZbXNwrdLQ?si=BTu9zXwtisW4uaYR